Plug gauge



April 26 1927 FLL, A-rwooD PLUG GAUGE Filed May 25. 1926 w T||||| i l "..Pasatea Aapagze, 1921. if

EDsTA'i-Es PATENT OFFICE.

I FRANCIS L. '.a'rwooi), or ANDERSON, INDIANA..

I UN-1T PLUG GAUGE.

Application tiled Hay 25,

' duce a plug gauge which may be accurately and economically manufactured, which has a separate gauging element which can be replaced when Worn, and in which the gauging element will have a longer life than have the gauging elements of gauges heretofore mad e 4 I accom lishthe abovev object by employing a han le, preferably cyhndrical, a apted to receive in .its end Vgauging elements which diiier slightly in size so that the whole "structure will forml a gauge of the go versilole in the han and; not-go type, and I construct my gauge. so that the gauging elements, and particularly the oe ement, will be rele so that when one end f such gauging element is worn below its Agauge e normal diameter the auging element can .be reversed in the han e, thus doubling the eective life of the gauge.

rIhe accompanying drawing'illustrates my invention: Fig. 1 is a perspective view of the assembled gauge -showing the go and auge elements in place in the not/ gon Fg I ig. 2 is a longitudinal section handle r through the handle; Fig. 8 is a perspective view of one end of the handle with the clamping cap removed; Fig. 4 is a fragmental longitudinal section illustrating the end of a gauge element of a slightly modilied form; Fig. 5 is a side elevation of a handle lug to be used in connection with ements of the type shown in Fig. 4; and Fi 6 is a ragmental longitudinal section il ustrating how gaugin elements oi dii'erent diameters may be a apted to one handle.

My improved gauge comprises a handle 10 provided Withan axial bore 11 in opposite ends of which ma be received a o gauge element 12 and a not-go gauge e ement 13. The bore 11 of the handle 10 is of such a diameter as to fit snugly the gauge elements 12 and 13. Near its ends, the handle 10 is reduced in diameter to provide pro]ectin collet portions 14, the exterior surface o each oi which is tav ered and provided with screw-threads 15. Y n each collet 14 .there is mounted a clamping collar 16 having a conical bore complementary to the conical outer surface of the projecting portion 14 and 192e. serial N.111,567.

gauge and also to facilitate rotation of the.

collars 16, lthe exterior surfaces of the handle 10 and ofthe collars 16 are preferably kuur-led. 1

D esirably some means is provided for posltively handle an gauge elements.` Centrally loa plug 20 which is secured to the handle las by the screw 21. At each end the plug 20 is provided with a pair of axially pro- )ecting pins 22 adapted res ectively to enter holes 23 in the adjacent en s of the gauging elements 10 to prevent relative-rotation of the gauging .elements and the handle. The holes 23 are provided in both ends lofthe gauging elements in order'that each augin element may be'reversed in the han le.

n Figs. 4 and 5 is illustrated a modified preventingy relative rotation of the cated wit-hin the. bore 11 of the handle 10 is means for preventing rotation of the gauge .l

elements in the hand In the` construction illustrated in Figs.,4 and 5' the plug 20, instead o being provided with the projecting' pins 22, is provided at each end with a l tongue 25 adapted to enter a 'transverse slot 26 in the ad]acent end of the au e element. Although I contemplate using andlea in which the diameter of the bore is substanthe gauge element 29 is provided with the,

holes 23 for the reception of the pins 22 or with the transverse slot 26 for the reception of the tongue 25.

In the gauge which I have described a gauge element may be easily removed and replaced with another. In addition, when the outer end of either gauging-element is Worn, the gauging element may be reversed inthe handle, thus in effect doubling the lizfe of each gauge element Although' I have described a gauge havin(r two gauge elements one of which is a go element and the other a not-go element, it will be evident that my invention can be einbodied in a gauge having a single gauge element.

it' is desired to I claim as my inventionz- 1. A plug gauge7 comprising a cylindrical gauge element, a handle having an axial hole in one end thereof for receiving either end of said gauge element, means for preventingrotation of said auge' element in said handle, and means acting at that end of said auge element which is received in such hole or holding said gauge element in said handle.

2. A plug gauge, comprising a cylindrical gauge element, a handle therefor, means carried by Said handle for exerting lateral pressure on said gauge element near an end thereof for holding said gauge element in place in said handle, both ends of said gauge element being substantially similar so that said handle may be applied to either end of said gauge element, and means for 'positively preventing rotation of said vgauge element in said handle.

3. A plug gauge as set forth in claim 2 with the addition that the means `for preventing rotation of the gauge element in the handle consists of a projection carried by nazaire e the handle and ada provided in the a gauge element.

ted to ente-r a depression jacent end face of said 4. A plug gauge, comprising acylindrical to receive either end of said gauge element,

means for collapsing said collet to cause it to grip the end of said gauging element, and means for preventing rotation of said gauge element in said handle.

5. A plugv gauge, comprising a cylindrical gauge element, a handle, said handle being provided with a collapsible collet adapted to receive either end of said gauge element, said collet having an internal'diameter substantially e ual to the diameter of said gauge element, an means for collapsing said collet to cause' it to grip the end of said gauging element. l

ln Witness whereof, I have hereunto set my hand at Anderson, Indiana, this 22nd day of May, A. D. one thousand nine hundred and twenty six.

FRANCIS L. ATWOOD. 

